GENERAL
169558
Revision
D
9
F. O-RING FACE SEAL (ORFS
HYDRAULIC FITTINGS)
* Torque values and angles shown are based on lubricated
connection, as in re-assembly.
** Always default to the torque value for evaluation of adequate
torque.
*** O-ring face seal type end not defined for this tube size.
a. Check components to ensure that the sealing
surfaces and fitting threads are free of burrs,
nicks, and scratches, or any foreign material.
b. Apply lubricant (typically Petroleum Jelly) to
O-ring and threads. If O-ring is
NOT
already
installed, install O-ring. Align the tube or hose
assembly.
c. Ensure that flat face of the mating flange comes
in full contact with O-ring.
d. Thread tube or hose nut until hand-tight. The nut
should turn freely until it is bottomed out.
Torque the fitting further to the specified number
of FFFT (“Flats From Finger Tight”), or to a
given torque value in the table shown in the
opposite column.
NOTE
If available, always hold the hex on
the fitting body to prevent unwanted
rotation of fitting body and hose when
tightening the fitting nut.
e. When assembling unions or two hoses together,
three wrenches will be required.
SAE
no.
Thd
size
(in.)
Tube
O.D.
(in.)
Torque value*
Recommended
turns to tighten
(after finger
tightening)**
lbf·ft N·m
Tube
nuts
Swivel
& hose
3 *** 3/16 ---
---
---
---
4 9/16 1/4 11–12 14–16 1/4–1/2
1/2–3/4
5 *** 5/16 ---
---
---
---
6 11/16 3/8 18–20 24–27
1/4–1/2
1/2–3/4
8 13/16 1/2 32–35 43–47
10 1 5/8 45–51 60–68
12 1-3/16 3/4
67–71
90–95
1/3–1/2
14 1-3/16 7/8
67–71
90–95
16 1-7/16 1
93–100 125–135
20 1-11/16 1-1/4 126–141 170–190
24 2 1-1/2
148–167
200–225
32
2-1/2
2 --- --- --- ---
